Add SourceBuffer implementations of Audio/VideoTracks

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 225 matching lines @@
             'html/HTMLUListElement.idl',
             'html/HTMLUnknownElement.idl',
             'html/ImageData.idl',
             'html/MediaError.idl',
             'html/RadioNodeList.idl',
             'html/TextMetrics.idl',
             'html/TimeRanges.idl',
             'html/ValidityState.idl',
             'html/VoidCallback.idl',
             'html/canvas/OffscreenCanvas.idl',
-            'html/track/AudioTrack.idl',
             'html/track/AudioTrackList.idl',
             'html/track/TextTrack.idl',
             'html/track/TextTrackCue.idl',
             'html/track/TextTrackCueList.idl',
             'html/track/TextTrackList.idl',
             'html/track/TrackEvent.idl',
-            'html/track/VideoTrack.idl',
             'html/track/VideoTrackList.idl',
             'html/track/vtt/VTTCue.idl',
             'html/track/vtt/VTTRegion.idl',
             'html/track/vtt/VTTRegionList.idl',
             'input/InputDeviceCapabilities.idl',
             'inspector/InspectorOverlayHost.idl',
             'loader/appcache/ApplicationCache.idl',
             'page/EventSource.idl',
             'page/PagePopupController.idl',
             'page/scrolling/ScrollState.idl',
@@ skipping 138 matching lines @@
             'dom/Touch.idl',
             'dom/URL.idl',
             'events/MouseEvent.idl',
             'frame/Navigator.idl',
             'frame/Screen.idl',
             'frame/Window.idl',
             'html/HTMLCanvasElement.idl',
             'html/HTMLInputElement.idl',
             'html/HTMLMediaElement.idl',
             'html/HTMLVideoElement.idl',
+            'html/track/AudioTrack.idl',
+            'html/track/VideoTrack.idl',
             'inspector/DevToolsHost.idl',
             'workers/DedicatedWorkerGlobalScope.idl',
             'workers/SharedWorkerGlobalScope.idl',
             'workers/WorkerGlobalScope.idl',
             'workers/WorkerNavigator.idl',
         ],
         # 'partial interface', target (right side of) 'implements', and
         # interfaces with static bindings (in bindings/core/v8/)
         'core_dependency_idl_files': [
             'animation/DocumentAnimation.idl',
@@ skipping 3621 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }